Fastest journey6hr 57m
Travelling by train from London to Montpellier is very easy. Take a Eurostar train from London to Paris, then a high-speed TGV to Montpellier. A change of station is necessary in Paris, but that's a hassle-free interchange. If you want to keep things really simple, you can instead travel from London to Lille Europe on Eurostar, connecting there with the onward TGV to Montpellier. You won't find quite the same choice of connections as on the Paris route, but at Lille there's no need to change stations as you switch from Eurostar to TGV.
Whether you choose to travel via Paris or Lille, booking for the London to Montpellier journey opens three months prior to your travel date. Book well in advance to get the cheapest fares.
There is more information about trains to Montpellier.
London to Paris
Board a Eurostar service from London to Paris. There are upwards of 15 trains to Paris from London each day with departures at least hourly from the beautifully restored station at St Pancras in London. The fastest trains speed to Paris in just 2 hrs 16 mins, with slower services taking up to 20 mins longer to reach the Gare du Nord in Paris. The first part of the journey from London sweeps through Thameside landscapes and rural Kent to reach the Channel Tunnel. Little more than an hour after leaving London you'll already be in northern France, tracking south through Flanders fields towards Paris.
Remember to factor in at least half an hour for Eurostar's airline-style baggage check prior to boarding your train. There is a luggage and body scan and you'll be asked to show your passport. There are no restrictions on taking liquids on board Eurostar trains.
Paris interchange: Paris Nord to Paris Lyon
When you alight from the train at Gare du Nord look for signs to the Metro and RER. Once you've bought a ticket follow the signs to 'RER D', direction 'Melun' or 'Malesherbes'. So long as you're heading in the right direction, all the trains on this line stop at Gare de Lyon. The actual train journey takes around 10 mins with just one stop on the way at Châtelet-les-Halles. Upon alighting from the RER train at Gare de Lyon, follow the signs to the mainline station. The signs read 'Accès aux trains Grandes Lignes'. The whole journey from the concourse at Gare du Nord to the mainline departure platforms at Gare de Lyon will normally take about 40 mins but we recommend leaving at least 50 mins.
If you are arriving at Gare du Nord from London, bear in mind that you can buy Paris Métro tickets at the Eurostar terminal at St. Pancras and on board the Eurostar train. Similarly, passengers arriving at the Gare du Nord on Thalys trains from Germany, Belgium and the Netherlands can buy Metro tickets on the train (at the Thalys Bar). Although universally referred to as Métro tickets, they are in fact valid on RER trains too.
Paris to Montpellier
There are 10 direct fast TGV trains each day from Paris to Montpellier, with up to 3 extra services on peak travel days. Services depart from the Gare de Lyon in Paris, stopping at Nîmes along the way and sometimes also at the TGV station in Valence. Arrival in Montpellier is at Saint-Roch station, from where it is just a short walk into the city centre.